You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

(CNN) The leadership of the AFL-CIO voted on Thursday to endorse Hillary Clinton for president, according to a spokesman for the union federation. "Hillary Clinton is a proven leader who shares our values," AFL-CIO President Richard Trumka said in a statement after the vote. "Throughout the campaign, she has demonstrated a strong commitment to the issues that matter to working people, and our members have taken notice. The activism of working people has already been a major force in this election and is now poised to elect Hillary Clinton and move America forward." The endorsement from the more than 12 million member organization is a boon for Clinton, who after clinching the Democratic nomination for president will face Republican presumptive nominee Donald Trump in November.The union has 12 million membersIt endorsed Clinton on Thursday 
 Questions:Last week, the AFL-_'s political committee voted to back Clinton in the general presidential election, a move that all but locked up the endorsement for the former secretary of state. (A) AFL (B) CIO (C) Hillary Clinton (D) Richard Trumka (E) America (F) Clinton (G) Democratic (H) Republican (I) Donald Trump
Output:
(B)